Kensington PowerLift Backup Battery and Dock for iPhone 4 and 3G/3GS - Charger - Retail Packaging - Black is one of the best product on the market today. The Kensington PowerLift Backup Battery and Dock for iPhone 4 and 3G/3GS - Charger - Retail Packaging - Black is a great product that everyone can invest on.

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From the Manufacturer

Kensington Powerlift™ Back-up Battery & Dock

The Kensington Powerlift™ Back-up Battery, Dock and Stand gives your iPhone® hours of extra power, converts for in-hand use, and offers a hands-free stand. The 1200 mAh battery pack provides rapid charging while the kickstand flips open to let you enjoy FaceTime® chats and videos with no hands or fear of running out of power.